/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsEditorOnlyExp/Public/SkeletalMesh/SkinWeightsPaintTool.h
For saveing/restoring the brush settings separately for each brush mode (Add, Replace, etc...)
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FSkinWeightBrushConfig
float
Falloff
EWeightBrushFal...
FalloffMode
float
Radius
float
Strength